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Cornerstone · Grades 3–5 Keystones #1 25 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 25 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄5 + 1⁄5

    Answer: 2⁄5
  2. 2. Algebra Two-step equations

    Solve: 7x + 13 = 41

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 70 in the ratio 3:4

    Answer: 30 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 20, 15, 37, 30, 37, 43, 27, 24

    Answer: 29.1

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